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Seiko SRPD23 (Samurai) Specifications
| Reference | SRPD23, SRPD23K1 |
|---|---|
| Case Size | 43.8mm |
| Lug Width | 22mm |
| Lug-to-Lug | 48.5mm |
| Thickness | 12.8mm |
| Case Material | stainless steel |
| Crystal | Hardlex |
| Water Resistance | 200m |
| Movement | 4R35 (automatic) |
| Bezel | rotating dive bezel |
| Crown | screw-down |
| Case Back | screw-down |
| Price Range | $300-$450 |
Compatible Straps for the Seiko SRPD23 (Samurai)
The SRPD23 (Samurai) uses a 22mm Lug Width and is compatible with the following strap types.
| Type | Recommended Brand | Why It Works | Price Range | Link |
|---|---|---|---|---|
| NATO/ZULU | Strapcode | Classic look, easy to swap, fits 22mm lugs | $15–$80 | |
| rubber/silicone | Crafter Blue | Water-resistant, comfortable for daily wear | $15–$80 | |
| oyster bracelet | Barton | Sporty bracelet, solid end links available | $15–$80 | |
| leather | Uncle Seiko | Dresses up the watch, fits 22mm lugs | $15–$80 | |
| canvas | Archer | Casual, durable field-watch aesthetic | $15–$80 |
Replacement Parts for the Seiko SRPD23 (Samurai)
| Part | Description | Compatibility Note |
|---|---|---|
| crystal (Hardlex or sapphire upgrade) | Protective cover over the dial | Fits 43.8mm case |
| bezel insert | Outer ring marking | Matches rotating dive bezel configuration |
| chapter ring | Inner ring with minute markings | Specific to 43.8mm case |
| crown with stem | Time-setting knob on case side | screw-down type |
| spring bars | Pins that hold the strap to the case | 22mm, 1.5mm diameter recommended |
| case back gasket | Seal that maintains water resistance | Required for 200m WR rating |
Modding the Seiko SRPD23 (Samurai)
The SRPD23 (Samurai) is a popular platform for modding. Here are the most common modifications.
- bezel insert — Swap the stock bezel insert for a ceramic, lumed, or differently colored option.
- crystal upgrade to sapphire — Upgrade the stock mineral/Hardlex crystal to a scratch-resistant sapphire crystal.
- chapter ring — Replace with a contrasting or lumed chapter ring for improved readability.
- dial swap — Install an aftermarket dial for a completely new look.
- bracelet upgrade — Upgrade to a premium aftermarket strap or metal bracelet.
Frequently Asked Questions
What lug width is the Seiko Samurai?
The Seiko SRPD23 Samurai has a 22mm lug width.
What movement does the Samurai use?
The SRPD23 uses the Seiko 4R35 automatic movement, which features hacking but not hand-winding.
Is the Samurai a good mod platform?
Yes. The Samurai case is popular for modding with aftermarket bezel inserts, sapphire crystals, and different dials. The angular case design gives it a distinct look compared to the rounder SKX or Turtle.